create 2d barcode vb.net PAINT EVENTS in Visual C#

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PAINT EVENTS
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ADD A NEW STATUS BAR PANEL Action 1 In the MainForm.cs Design window, display the StatusBarPanel Collection Editor for the statusBar1 control.
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Result The StatusBarPanel Collection Editor dialog appears as was shown in chapter 4.
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a. Display the properties for this control. b. Click on the Panels property item. c. Click the button. 2 Add a new StatusBarPanel in this dialog just before the existing sbpnlImagePercent panel.
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The new panel is added to the Panels collection. The source code in the InitializeComponent method is updated to define the new panel and add it to the status bar.
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a. Click the Add button. b. Click the up arrow in the center of the dialog to move the panel just beforethe image percent panel. c. Assign the proper settings as shown. d. Click OK to add the panel.
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(Name) AutoSize ToolTipText
Value
sbpnlFileIndex Contents Image Index sbpnlFileIndex.Text = String.Format ("{0:#}/{1:#}", _album.CurrentPosition+1, _album.Count);
In the OnPaint method, set the text for this panel to contain the image index and album size.
The preceding tables have made a number of changes to the OnPaint method. The following code pulls together all of the pieces presented in the preceding tables. We will not discuss these changes in additional detail.
protected override void OnPaint(PaintEventArgs e) { if (_album.Count > 0) { // Paint the current image Photograph photo = _album.CurrentPhoto; pbxPhoto.Image = photo.Image; // Update the status bar. sbpnlFileName.Text = photo.FileName; sbpnlFileIndex.Text = String.Format("{0}/{1}", _album.CurrentPosition+1, _album.Count); sbpnlImageSize.Text = String.Format("{0} x {1}", photo.Image.Width, photo.Image.Height);
CHA PTE R 6
COMMON FILE DIALOGS
statusBar1.ShowPanels = true; } else { // Indicate the album is empty pbxPhoto.Image = null; statusBar1.Text = "No Photos in Album"; statusBar1.ShowPanels = false; } statusBar1.Invalidate(); base.OnPaint(e); }
Our code is coming along. We can add new photos to the album, and remove the photo currently displayed.
TRY IT!
Compile the code and verify that you can add and remove images to the album. Make sure you can add multiple images at once by selecting a range of images with the Shift key. This can be done by clicking the first file, holding down the Shift key, and then clicking the last file. You can also select multiple single images with the Ctrl key by clicking the first, holding down the Ctrl key, clicking the second, and so on. Also see what happens when a nonimage file is specified. You should see our invalid image with the red X that we created in chapter 5. This indicates to the user that something is wrong, but maintains the image paradigm used by our application.
The current code does not allow us to move to the next and previous images in the album, so only the first photo in the album is ever displayed. Navigating within the album using the Next and Previous menus is our next topic.
CONTEXT MENUS REVISITED
In this section we implement the Next and Previous menu items for our application. These menus are part of the View menu on the main menu bar. If you recall, this menu was cloned and assigned to the context menu for use with the PictureBox control. Our careful implementation in chapter 3 ensured that the contents of the context menu always match the contents of the View menu. In fact, your application should include these menus now, as can be seen in figure 6.2.
CONTEXT MENUS REVISITED
Figure 6.2 A context menu displays keyboard shortcuts just like the main menu. As a special treat, an image not yet seen in this book is shown here.
The handlers for Next and Previous use concepts we have previously discussed, so let s get to it. 6.4.1 DISPLAYING THE NEXT PHOTOGRAPH The Next handler uses the CurrentNext method from our PhotoAlbum class, and is implemented using the following steps.
Set the version number of the MyPhotos application to 6.4. IMPLEMENT HANDLER FOR THE NEXT MENU Action 1 Add a Click handler for the Next menu item. Implement this handler using the CurrentNext method.
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